Wireless power transmission/reception device

ABSTRACT

The present description relates to a wireless power transmission/reception device. The present description provides a magnetic field controlling member for focusing a magnetic field between a primary coil, which is connected to a power source of a wireless power transmission system and forms a magnetic field, and a secondary coil which is for receiving power by means of the magnetic field. The magnetic field controlling member includes: a substrate, between the primary coil and secondary coil, of which one side faces the primary coil or secondary coil; a pattern unit which is placed on the substrate and has a plurality of thin films that are positioned at a predetermined distance away from each other; and a connecting unit which electrically connects the plurality of thin films.

TECHNICAL FIELD

The present invention relates to wireless charging, and moreparticularly, to a wireless power receiver/transmitter.

BACKGROUND ART

The wireless power transfer technology is a technology that wirelesslydelivers power between a power source and an electronic device. Forexample, the wireless power transfer technology enables a battery of awireless terminal to be charged by simply placing a wireless terminalsuch as a smart phone or a tablet on a wireless charging pad. Thus,compared to a wired charging environment using a typical wired chargingconnector, the mobility, convenience, and safety can be improved. Inaddition to wireless charging of wireless terminals, the wireless powertransfer technology is attracting attention as a substitute for theexisting wired power transfer environment in various fields such aselectric vehicles, wearable devices such as Bluetooth earphones or 3Dglasses, home appliances, furniture, underground facilities, buildings,medical devices, robots, and leisure.

The wireless power transfer method is also referred to as a contactlesspower transfer method, a no point of contact power transfer method, or awireless charging method. The wireless power transfer system includes awireless power transfer apparatus for supplying electric energy by awireless power transfer method and a wireless power receiving apparatusfor receiving electric energy wirelessly supplied from the wirelesspower transfer apparatus and supplying power to a power receiving devicesuch as a battery cell.

The wireless power transfer technologies are largely classified into amagnetic induction method and a magnetic resonance method. In themagnetic induction method, energy is transmitted using a current inducedat a receiving side coil due to a magnetic field generated in a coilbattery cell at a transmitting side in accordance with electromagneticcoupling between a coil at the transmitting side and a coil at thereceiving side. The magnetic induction type of wireless power transfertechnology has an advantage of high transmission efficiency, but haslimitations in that the power transfer distance is limited to severalmillimeters and the degrees of the location freedom is significantly lowdue to sensitivity to matching between coils.

The magnetic resonance method is similar to the magnetic inductionmethod in that both methods use a magnetic field. However, in themagnetic resonance method, a resonance occurs when a specific resonancefrequency is applied to the coil at the transmission side and the coilat the reception side, and thus energy is transferred by a phenomenonthat the magnetic field is focused on both ends of the transmission sideand the reception side, which differs from magnetic induction method interms of energy transfer. Due to these characteristics of magneticresonance, power can be remotely transmitted unlike magnetic induction.The magnetic resonance method may transmit energy up to a relativelylong distance of several tens of centimeters to several meters comparedto the magnetic induction method, and enables power transmission to aplurality of devices at the same time. Thus, the magnetic resonancemethod is expected to be a wireless power transfer technology toimplement cord-free.

DISCLOSURE Technical Problem

The present invention provides a wireless power receiver/transmitterwith less noise and improved transmission efficiency.

Technical Solution

According to an aspect of the present invention, there is provided amagnetic field control member for focusing a magnetic field between aprimary coil connected to a power source of a wireless power transfersystem and forming a magnetic field and a secondary coil receiving powerthrough the magnetic field, the member including: a substrate having onesurface disposed between the primary coil and the secondary coil so asto face the primary coil or the secondary coil; a pattern unit disposedover the substrate and including a plurality of thin films spaced apartfrom each other by a certain interval; and a connection unitelectrically connecting the plurality of thin films.

The magnetic field control member may allow a magnetic field formed fromthe primary coil to be focused on the secondary coil.

The plurality of thin films may have a linear shape with the samelength.

The plurality of thin films may be spaced from each other at the sameinterval.

The interval of the plurality of thin films may be about 1 mm.

The pattern unit may be formed of copper or a mixture or compoundcontaining copper.

The connection unit may electrically connect one ends of the pluralityof thin films to each other.

The connection unit may electrically connect both ends of the pluralityof thin films to each other.

The connection unit may be electrically connected by a conductivematerial formed of one of gold, copper, and aluminum, or a mixture oftwo or more thereof.

According to another aspect of the present invention, there is provideda wireless power transmitter including: a transmitting antenna forming amagnetic field; and a magnetic field control member having one surfacethereof facing the transmitting antenna or a wireless power receiverthat receives power through the magnetic field, wherein the magneticfield control member includes: a substrate; a pattern unit formed overthe substrate and including a plurality of thin films spaced apart fromeach other by a certain interval; and a connection unit electricallyconnecting the plurality of thin films.

According to another aspect of the present invention, there is provideda wireless power receiver including: a receiving antenna for receivingpower through a magnetic field formed from a wireless power transmitter;and a magnetic field control member having one surface thereof facingthe receiving antenna or a wireless power transmitter, wherein themagnetic field control member includes: a substrate; a pattern unitformed over the substrate and including a plurality of thin films spacedapart from each other by a certain interval; and a connection unitelectrically connecting the plurality of thin films.

Advantageous Effects

According to the embodiments, the magnetic field generated in theprimary coil can be focused on the secondary coil, and the coupling ofthe primary coil and the secondary coil can be improved, therebyproviding a wireless charging system with reduced noise and improvedefficiency.

DESCRIPTION OF DRAWINGS

FIG. 1 is a view illustrating a wireless power system according to anembodiment of the present invention.

FIG. 2 is a view illustrating a wireless power transmitter according toan embodiment of the present invention.

FIG. 3 is a view illustrating a wireless power receiver according to anembodiment of the present invention.

FIG. 4 is a schematic view illustrating a wireless charging systemaccording to an embodiment the present invention.

FIG. 5 is a cross-sectional view illustrating a magnetic field controlmember 3300 according to an embodiment of the present invention.

FIGS. 6 to 8 are plan views illustrating a pattern unit according to anembodiment of the present invention.

BEST MODES

The term ‘wireless power’ below is used to mean any type of energyassociated with an electric field, a magnetic field, and anelectromagnetic field transmitted from a transmitter to a receiverwithout the use of physical electromagnetic conductors. The wirelesspower may also be referred to as a power signal, and may denote anoscillating magnetic flux enclosed by the primary and secondary coils.For example, power conversion in a system to wirelessly charge devicesincluding mobile phones, cordless phones, iPods, MP3 players, headsetsand the like will be described herein. In general, the basic principlesof wireless power transfer include, for example, both magnetic inductionmethod and magnetic resonance method.

FIG. 1 is a view illustrating a wireless power system 1000 according toan embodiment of the present invention.

Referring to FIG. 1, a wireless power system 1000 includes a wirelesspower transmitter 1100, a wireless power receiver 1200, and a wirelesspower receiver/transmitter 1300. The wireless power system 1000 maywirelessly transmit power using a magnetic field. The wirelesstransmission of electric power may be performed using a magneticinduction method or a magnetic resonance method. In this case, thewireless transmission of electric power may be performed between atransmitting antenna 1120 of the wireless power transmitter 1100 and areceiving antenna 1210 of the wireless power receiver 1200.

The wireless power transmitter 1100 receives power from an externalpower source S, and generates a magnetic field. The wireless powerreceiver 1200 generates a current using the generated magnetic field,and wirelessly receives power. The wireless power receiver/transmitter1300 may wirelessly receive power using the generated magnetic fieldsimilarly to the wireless power receiver 1200. Also, the wireless powerreceiver/transmitter 1300 may generate a magnetic field similarly to thewireless power transmitter 1100. In this case, the wireless powerreceiver/transmitter 1300 may generate a magnetic field using powerstored in a battery instead of an external power source. The wirelesspower receiver/transmitter 1300 may be a relay or a repeater forincreasing the wireless power transfer distance. As the repeater, apassive type of resonance loop implemented with an LC circuit may beused. Such a resonance loop may focus a magnetic field radiated into theatmosphere, and may increase the wireless power transfer distance. It isalso possible to secure a wider wireless power transfer coverage usingseveral repeaters at the same time.

Thus, in the wireless power system 1000 as shown in FIG. 1, power may betransmitted from the wireless power transmitter 1100 to the wirelesspower receiver/transmitter 1300, and the wireless powerreceiver/transmitter 1300 may again deliver power to the wireless powerreceiver 1200.

Also, in the wireless power system 1000, the wireless power transmitter1100, the wireless power receiver 1200, and the wireless powerreceiver/transmitter 1300 may transmit/receive various kinds ofinformation required for wireless power transfer. Here, thecommunication among the wireless power transmitter 1100, the wirelesspower receiver 1200, and the wireless power receiver/transmitter 1300may be performed according to one of an in-band communication methodthat uses a magnetic field used for wireless power transfer and anout-band communication method that uses a separate communicationcarrier.

Here, the wireless power transmitter 1100 may be provided as a fixedtype or a movable type. Examples of the fixed type include a formembedded into a ceiling or wall of a room or furniture such as a table,a form implanted in an outdoor parking lot, a bus stop or a subwaystation, and a form installed in a vehicle such as a car or a train. Thewireless power transmitter 1100 that is a movable type may beimplemented as a mobile device having a movable weight or size, or apart of other devices such as a cover of a notebook computer.

Also, the wireless power receiver 1200 and the wireless powerreceiver/transmitter 1300 should be interpreted as a comprehensiveconcept including various kinds of electronic devices equipped withbatteries and various kinds of home appliances that are supplied withpower wirelessly instead of power cables and are operated.Representative examples of the wireless power receiver 1200 includeportable terminals, cellular phones, smart phones, Personal DigitalAssistants (PDAs), Portable Media Player (PMPs), Wibro terminals,tablets, phablets, notebooks, digital cameras, navigation terminals,televisions, and Electronic Vehicles (EVs).

In the wireless power system 1000, the wireless power receiver 1200 andthe wireless power receiver/transmitter 1300 may be disposed insingularity or plurality. In FIG. 1, the wireless power transmitter1100, the wireless power receiver 1200, and a wireless powerreceiver/transmitter 1300 are illustrated as transmitting/receivingpower in a one-to-one manner, but one wireless power transmitter 1100may also deliver power to a plurality of wireless power receivers 1200or a plurality of wireless power receiver/transmitters 1300.Particularly, in the case of performing wireless power transfer by themagnetic resonance method, one wireless power transmitter 1100 maysimultaneously deliver power to a plurality of wireless power receivers1200 and a plurality of wireless power receiver/transmitters 1300 byapplying a simultaneous transmission method or a time divisiontransmission method.

Also, in FIG. 1, the wireless power transmitter 1100 is illustrated asdelivering power to the wireless power receiver/transmitter 1300, andthe wireless power receiver/transmitter 1300 is illustrated asdelivering power to the wireless power receiver 1200, but the wirelesspower transmitter 1100 may directly deliver power to the wireless powerreceiver 1200 or to both the wireless power receiver 1200 and thewireless power receiver/transmitter 1300.

Hereinafter, the wireless power transmitter 1100 and the wireless powerreceiver 1200 according to an embodiment of the present invention willbe described.

FIG. 2 is a view illustrating a wireless power transmitter 1100according to an embodiment of the present invention.

Referring to FIG. 2, the wireless power transmitter 1100 may include apower transmission module 1110, a transmitting antenna 1120, acommunication module 1130, and a controller 1140.

The power transmission module 1110 may generate transmission power usinga power source applied from an external power source S. The powertransmission module 1110 may include an AC-DC converter 1111, afrequency oscillator 1112, a power amplifier 1113, and an impedancematcher 1114.

The AC-DC converter 1111 may convert AC power to DC power. The AC-DCconverter 1111 receives AC power from the external power source S, andconverts the waveform of the inputted AC power into DC power, andoutputs DC power. The AC-DC converter 1111 may adjust a voltage value ofthe outputted DC power.

The frequency oscillator 1112 may convert DC power into AC power of aspecific frequency that is desired. The frequency oscillator 1112receives DC power outputted from the AC-DC converter 1111, and convertsthe received DC power into AC power of a specific frequency to outputthe converted AC power. Here, the specific frequency may be a resonancefrequency. In this case, the frequency oscillator 1112 may output ACpower of the resonance frequency. Naturally, the frequency oscillator1112 does not necessarily oscillate the resonance frequency.

The power amplifier 1113 may amplify a voltage or current of power.

The power amplifier 1113 receives AC power of a specific frequencyoutputted from the frequency oscillator 1112, and amplifies the voltageor current of the inputted AC power of the specific frequency to outputthe amplified voltage or current.

The impedance matcher 1114 may perform impedance matching. The impedancematcher 1114 may include a capacitor, an inductor, and a switchingelement for switching the connection of the capacitor and the inductor.The impedance matching may be performed by detecting a reflection waveof wireless power transmitted through the transmitting antenna 1120 andswitching the switching element based on the detected reflection wave toadjust the connection state of the capacitor or the inductor, adjust thecapacitance of the capacitor, or adjust the impedance of the inductor.According to circumstances, the impedance matcher 1114 may be omitted,and the present disclosure also includes embodiments of the wirelesspower transmitter 1100 from which the impedance matcher 1114 is omitted.

The transmitting antenna 1120 may generate an electromagnetic fieldusing AC power. The transmitting antenna 1120 may receive AC power of aspecific frequency outputted from the power amplifier 1113, and maygenerate a magnetic field of a specific frequency. The generatedmagnetic field is radiated, and the wireless power receiver 1200receives the magnetic field to generate a current. In other words, thetransmitting antenna 1120 wirelessly transmits power.

When the magnetic induction method is used, the transmitting antenna1120 or the receiving antenna 1210 may have any suitable forms as a coilstructure, and may be a copper wire wound around formation having a highpermeability, such as ferrite or amorphous metal. The transmittingantenna 1120 may be referred to as a primary coil, a primary core, aprimary winding, or a primary loop antenna. On the other hand, thereceiving antenna 1210 may be referred to as a secondary coil, asecondary core, a secondary winding, a secondary loop antenna, or apickup antenna.

When the magnetic resonance method is used, the transmitting antenna1120 and the receiving antenna 1210 may be provided in a form ofresonance antenna, respectively. The resonance antenna may have aresonant structure including a coil and a capacitor. In this case, theresonance frequency of the resonance antenna is determined by theinductance of the coil and the capacitance of the capacitor. Here, thecoil may be configured in a form of loop. Also, a core may be disposedinside the loop. The core may include a physical core such as a ferritecore, or may include an air core.

The energy transfer between the transmitting antenna 1120 and thereceiving antenna 1210 may be performed through a resonance phenomenonof a magnetic field. The resonance phenomenon refers to a phenomenon inwhich when a near-field corresponding to the resonance frequency isgenerated in one resonance antenna and another resonance antenna islocated therearound, both resonance antennas are coupled to each otherand thus high efficient energy transfer occurs between the resonanceantennas. When a magnetic field corresponding to a resonance frequencyoccurs between the resonance antenna of the transmitting antenna 1120and the resonance antenna of the receiving antenna 1210, a phenomenonoccurs in which the resonance antennas of the transmitting antenna 1120and the receiving antenna 1210 resonate with each other. Accordingly,the magnetic field may be generally focused toward the receiving antenna1210 with higher efficiency than a case where the magnetic fieldgenerated by the transmitting antenna 1120 is radiated to the free spaceand thus energy may be delivered with high efficiency from thetransmitting antenna 1120 to the receiving antenna 1210. The magneticinduction method may be implemented similarly to the magnetic resonancemethod, but in this case, the frequency of the magnetic field need notbe a resonance frequency. Instead, in the magnetic induction method,matching between the loops constituting the receiving antenna 1210 andthe transmitting antenna 1120 is needed, and an interval between theloops need to be very close.

On the other hand, although not shown in FIG. 2, the wireless powertransmitter 1100 may further include a communication antenna. Thecommunication antenna may transmit and receive a communication signalusing a communication carrier except the magnetic field communication.For example, the communication antenna may transmit and receivecommunication signals such as Wi-Fi, Bluetooth, Bluetooth LE, ZigBee,and NFC.

The communication module 1130 may transmit and receive information toand from the wireless power receiver 1200 or the wireless powerreceiver/transmitter 1300. The communication module 1130 may include atleast one of an in-band communication module or an out-bandcommunication module.

The in-band communication module may transmit and receive informationusing a magnetic wave having a specific frequency as a center frequency.For example, the communication module 1130 may perform in-bandcommunication by transmitting a magnetic wave containing informationthrough the transmitting antenna 1120 or by receiving a magnetic wavecontaining information through the transmitting antenna 1120. In thiscase, information may be contained in a magnetic wave or a magnetic wavecontaining information may be interpreted using a modulation method suchas Binary Phase Shift Keying (BPSK) or Amplitude Shift Keying (ASK) anda coding method such as a Manchester coding or non-return-to-zero level(NZR-L) coding. When this in-band communication is used, thecommunication module 1130 may transmit and receive information up toseveral meters in a data transmission rate of several kbps.

The out-band communication module may perform out-band communicationthrough the communication antenna. For example, the communication module1130 may be provided as a short-range communication module. Examples ofshort-range communication modules include communication modules such asWi-Fi, Bluetooth, Bluetooth LE, ZigBee, and NFC.

The controller 1140 may control the overall operation of the wirelesspower transmitter 1100. The controller 1140 may perform calculation andprocessing of various kinds of information, and may control eachcomponent of the wireless power transmitter 1100.

The controller 1140 may be implemented in a computer or a device similarthereto using hardware, software, or a combination thereof. In terms ofhardware, the controller 1140 may be provided in a form of electroniccircuit that processes electrical signals to perform control functions,and in terms of software, may be provided in a form of a program thatdrives the hardware controller 1140.

Hereinafter, the wireless power receiver 1200 according to an embodimentof the present invention will be described.

FIG. 3 is a view illustrating a wireless power receiver 1200 accordingto an embodiment of the present invention.

Referring to FIG. 3, the wireless power receiver 1200 may include areceiving antenna 1210, a power reception module 1220, a communicationmodule 1230, and a controller 1240. The wireless power receiver 1200 maywirelessly receive power.

The receiving antenna 1210 may receive wireless power transmitted fromthe wireless power transmitter 1100 or the wireless powerreceiver/transmitter 1300. The receiving antenna 1210 may receive powerusing a magnetic field that is emitted by the transmitting antenna 1120.Here, when a specific frequency is a resonance frequency, a magneticresonance phenomenon may occur between the transmitting antenna 1120 andthe receiving antenna 1210, thereby enabling more efficient powertransfer.

The power reception module 1220 may charge or drive the wireless powerreceiver 1200 using power received by the receiving antenna 1210. Thepower reception module 1220 may include an impedance matcher 1221, arectifier 1222, a DC-DC converter 1223, and a battery 1224.

The impedance matcher 1221 may adjust the impedance of the wirelesspower receiver 1200. The impedance matcher 1221 may include a capacitor,an inductor, and a switching element that switches a combinationthereof. The matching of the impedances may be performed by controllingthe switching element of the circuit constituting the impedance matcher1221 based on a voltage value or a current value, a power value, and afrequency value of wire power that is received. According tocircumstances, the impedance matcher 1221 may be omitted, and thepresent disclosure also includes embodiments of the wireless powerreceiver 1200 from which the impedance matcher 1221 is omitted.

The rectifier 1222 may rectify the received wireless power, and mayconvert the rectified power from AC to DC. The rectifier 1222 mayconvert AC into DC using a diode or a transistor, and may smooth DCusing a capacitor and a resistor. As the rectifier 1222, a full-waverectifier, a half-wave rectifier, and a voltage multiplier implementedby a bridge circuit, etc. may be used.

The DC-DC converter 1223 may convert the rectified DC power voltage intoa desired level, and output the converted DC power. When the voltagevalue of the DC power source rectified by the rectifier 1222 is largeror smaller than the voltage value required for charging a battery ordriving an electronic device, the DC-DC converter 1223 may change thevoltage value of the rectified DC power source into a desired voltage.

The battery 1224 may store energy using power outputted from the DC-DCconverter 1223. On the other hand, the battery 1224 is not necessarilyincluded in the wireless power receiver 1200. For example, the batterymay be provided as an external configuration of a detachable form. Asanother example, the wireless power receiver 1200 may include a drivingunit for driving various operations of an electronic device instead ofthe battery 1224.

On the other hand, although not shown in FIG. 3, the wireless powerreceiver 1200 may further include a communication antenna. Thecommunication antenna may transmit and receive a communication signalusing a communication carrier except the magnetic field communication.For example, the communication antenna may transmit and receivecommunication signals such as Wi-Fi, Bluetooth, Bluetooth LE, ZigBee,and NFC.

The communication module 1230 may transmit and receive information toand from the wireless power transmitter 1100 or the wireless powerreceiver/transmitter 1300. The communication module 1230 may include atleast one of an in-band communication module or an out-bandcommunication module.

The in-band communication module may transmit and receive informationusing a magnetic wave having a specific frequency as a center frequency.For example, the communication module 1230 may perform in-bandcommunication by transmitting a magnetic wave containing informationthrough the receiving antenna 1210 or by receiving a magnetic wavecontaining information through the receiving antenna 1210. In this case,information may be contained in a magnetic wave or a magnetic wavecontaining information may be interpreted using a modulation method suchas Binary Phase Shift Keying (BPSK) or Amplitude Shift Keying (ASK) anda coding method such as a Manchester coding or non-return-to-zero level(NZR-L) coding. When this in-band communication is used, thecommunication module 1230 may transmit and receive information up toseveral meters in a data transmission rate of several kbps.

The out-band communication module may perform out-band communicationthrough the communication antenna. For example, the communication module1230 may be provided as a short-range communication module.

Examples of short-range communication modules include communicationmodules such as Wi-Fi, Bluetooth, Bluetooth LE, ZigBee, and NFC.

The controller 1240 may control the overall operation of the wirelesspower receiver 1200. The controller 1240 may perform calculation andprocessing of various kinds of information, and may control eachcomponent of the wireless power receiver 1200.

The controller 1240 may be implemented in a computer or a device similarthereto using hardware, software, or a combination thereof. In terms ofhardware, the controller 1240 may be provided in a form of electroniccircuit that processes electrical signals to perform control functions,and in terms of software, may be provided in a form of a program thatdrives the hardware controller 1240.

FIG. 4 is a schematic view illustrating a wireless charging systemaccording to an embodiment the present invention. Referring to FIG. 4, awireless power system 2000 according to an embodiment includes awireless power transmitter 2100, a wireless power receiver 2200, and amagnetic control member 2300.

The wireless power transmitter 2100 may wireless transmit power, andalthough not shown, may include a power transmission module 2110, atransmitting antenna 2120, a communication module 2130, and a controller2140. The respective components may perform the same or similarfunctions as the power transmission module 1110, the transmittingantenna 1120, the communication module 1130, and the controller 1140 ofFIG. 2.

The transmitting antenna 2120 may include a primary coil, and maygenerate an electromagnetic field.

Also, the wireless power receiver 2200 may wirelessly receive power, andalthough not shown, may include a receiving antenna 2210, a powerreception module 2220, a communication module 2230, and a controller2240. The respective components may perform the same or similarfunctions as the power reception module 1220, the communication module1230, and the controller 1240 of FIG. 3.

The receiving antenna 2210 may include a secondary coil, and may receivepower from the wireless power transmitter 2100 through a magnetic fieldgenerated from the transmitting antenna 2120.

The magnetic field control member 2300 is disposed between the primarycoil 2120 of the wireless power transmitter 2100 and the secondary coil2210 of the wireless power receiver 2200 as shown in FIG. 4, i.e., at amagnetic field path of the primary coil 2120 and the secondary coil2210, and may be disposed such that one surface thereof faces theprimary coil 2120 or the secondary coil 2210.

Also, the magnetic field control member 2300 may be disposed such thatone surface thereof faces the primary coil 2120 and the opposite surfacethereof faces the secondary coil 2210.

In addition, the magnetic field control member 2300 may be disposedadjacent to the primary coil 2120 so as to be coupled to the wirelesspower transmitter 2100, or may be disposed adjacent to the secondarycoil 2210 so as to be coupled to the wireless power receiver 2200.

In a typical wireless charging system, since the size of the primarycoil is relatively much larger than the size of the secondary coil, amagnetic field formed from the primary coil is not intensivelytransmitted to the secondary coil, but widely reaches the periphery ofthe secondary coil. Thus, the electronic devices or parts around thesecondary coil may receive an undesired magnetic field, thereby causingmalfunction of the peripheral electronic devices.

The magnetic field control member 2300 may allow the magnetic fieldformed in the primary coil 2120 to be focused on the secondary coil2210, thereby reducing a power loss, improving the charging efficiency,and reducing an influence of the magnetic field on parts other than thesecondary coil 2210. For this, a repeater or relay function is providedin a region where the secondary coil 2210 is located on the magneticcontrol member 2300 in a path through which the magnetic field formed inthe primary coil 2120 moves to the secondary coil 2210, and on the otherhand, a magnetic field interruption function is provided in a regionwhere the secondary coil 2210 is not located on the magnetic controlmember 2300 in a path through which the magnetic field formed in theprimary coil 2120 moves to the secondary coil 2210. Thus, it is possibleto prevent peripheral electronic device from malfunctioning due to themagnetic field.

FIG. 5 is a cross-sectional view illustrating a magnetic field controlmember 3300 according to an embodiment of the present invention.Referring to FIG. 5, the magnetic field control member 3300 according toan embodiment of the present invention may include a substrate 3310, apattern unit 3320, and a connection unit 3330. The substrate 3310 may beformed of an insulating material, and may be a Printed Circuit Board(PCB). The pattern unit 3320 may be formed of a plurality of thin filmsspaced apart from each other by a predetermined distance. For example, aplurality of linear thin films may be provided in a form of beingarranged side by side while facing one side. The pattern unit 3320 maybe formed of copper, or a mixture or a compound including copper.

Also, the thin films constituting the pattern unit 3320 may beelectrically connected by the connection unit 3330. The connection unit3330 may be configured with a solder or other conductive materials. Theconnection unit 3330 may be formed of one of gold, copper, and aluminum,or a mixture of two or more thereof. The connection unit 3330 may beformed of various types of conductive materials such as a thin film or awire. Also, the connection unit 3330 may be formed over or in thesubstrate 3310.

FIGS. 6 to 8 are plan views illustrating a pattern unit according to anembodiment of the present invention.

Referring to FIG. 6, a pattern unit 4320 according to an embodiment ofthe present invention may be provided on a substrate 4310 such that aplurality of linear thin films are disposed side by side while facingone side each other. The plurality of thin films may have the samelength, and may be spaced apart from each other at the same interval.For example, the plurality of thin films may be spaced apart from eachother at an interval of about 1 mm.

One ends of the thin films constituting the pattern unit 4320 may beelectrically connected by a connection unit 4330. The connection unit4330 may be formed of a solder or a conductive material, and theconductive material may be various types of conductive material such asthin film or wire. Also, the connection unit 4330 may be formed over orin the substrate 4310.

Referring to FIG. 7, a pattern unit 5320 according to an embodiment ofthe present invention may be provided on a substrate 5310 such that aplurality of linear thin films having the same length are disposed sideby side while facing one side and one ends of the linear thin films areconnected to each other and thus blocked. The linear thin films may bespaced apart from each other at the same interval, and for example, maybe spaced apart from each other at an interval of about 1 mm.

Referring to FIG. 8, a pattern unit 6320 according to an embodiment ofthe present invention may be provided on a substrate 6310 such that aplurality of linear thin films having the same length are disposed sideby side while facing one side and both ends of the linear thin films areconnected to each other and thus blocked. The linear thin films may bespaced apart from each other at the same interval, and for example, maybe spaced apart from each other at an interval of about 1 mm.

The magnetic field control member according to the embodiment of thepresent invention may be provided while being separated from the powertransmitter or the power receiver, or may be provided while beingcoupled to the power transmitter or the power receiver.

According to the embodiments, the magnetic field generated in theprimary coil may be focused on the secondary coil, and the coupling ofthe primary coil and the secondary coil may be improved, therebyproviding a wireless charging system with reduced noise and improvedefficiency.

Since the wireless power transmitting method and apparatus or thewireless power receiving apparatus and method according to an embodimentof the present invention does not necessarily include all the elementsor operations, the wireless power transmitting apparatus and method andthe wireless power transmitting apparatus and method may be performedwith the above-mentioned components or some or all of the operations.Also, embodiments of the above-described wireless power transmittingapparatus and method, or receiving apparatus and method may be performedin combination with each other. Also, each element or operationdescribed above is necessarily performed in the order as described, andan operation described later may be performed prior to an operationdescribed earlier.

The description above is merely illustrating the technical spirit of thepresent invention, and various changes and modifications may be made bythose skilled in the art without departing from the essentialcharacteristics of the present invention. Therefore, the embodiments ofthe present invention described above may be implemented separately orin combination with each other.

Therefore, the embodiments disclosed in the present invention areintended to illustrate rather than limit the scope of the presentinvention, and the scope of the technical spirit of the presentinvention is not limited by these embodiments. The scope of the presentinvention should be construed by claims below, and all technical spiritswithin a range equivalent to claims should be construed as beingincluded in the right scope of the present invention.

1-11. (canceled)
 12. An apparatus comprising: a first surface configuredto face a primary coil a wireless power transmitter that generates amagnetic field; a second surface configured to face a secondary coil ofa wireless power receiver that receives power via the magnetic field;and a magnetic field control member on either the first surface or thesecond surface, wherein the magnetic field control member is configuredto focus the magnetic field between the primary coil and the secondarycoil.
 13. The apparatus of claim 12, wherein the magnetic field controlmember is configured to cause the magnetic field to be focused on thesecondary coil to reduce an influence of the magnetic field on parts ofthe wireless power receiver other than the secondary coil.
 14. Theapparatus of claim 12, wherein the magnetic field control memberincludes a pattern unit comprising a plurality of thin films spacedapart from each other by a fixed interval.
 15. The apparatus of claim14, wherein the first surface and the second surface are opposite sidesof a substrate, and wherein the pattern unit is disposed on one side ofthe substrate.
 16. The apparatus of claim 14, wherein the magnetic fieldcontrol member further includes a connection unit electricallyconnecting the plurality of thin films.
 17. The apparatus of claim 16,wherein the connection unit electrically connects one ends of theplurality of thin films to each other.
 18. The apparatus of claim 16,wherein the connection unit electrically connects both ends of theplurality of thin films to each other.
 19. The apparatus of claim 14,wherein each of the plurality of thin films have a linear shape with thesame length.
 20. The apparatus of claim 14, wherein each the pluralityof thin films are spaced from each other at a same interval.
 21. Theapparatus of claim 20, wherein the interval of the plurality of thinfilms is about 1 mm.
 22. The apparatus of claim 14, wherein the patternunit is formed of copper or a mixture or compound containing copper. 23.A wireless power transmitter comprising: a primary coil configured togenerate a magnetic field; and a magnetic field control member having afirst portion thereof configured to face the primary coil and a secondportion thereof configured to face a secondary coil of a wireless powerreceiver that receives power via the magnetic field, wherein themagnetic field control member is configured to focus the magnetic fieldbetween the primary coil and the secondary coil.
 24. The wireless powertransmitter of claim 23, wherein the magnetic field control member isconfigured to cause the magnetic field to be focused on the secondarycoil to reduce an influence of the magnetic field on parts of thewireless power receiver other than the secondary coil.
 25. The wirelesspower transmitter of claim 23, wherein the magnetic field control memberincludes a pattern unit comprising a plurality of thin films spacedapart from each other by a fixed interval.
 26. The wireless powertransmitter of claim 25, wherein the first portion and the secondportion represent opposite sides of a substrate, and wherein the patternunit is disposed on one side of the substrate.
 27. The wireless powertransmitter of claim 25, wherein the magnetic field control memberfurther includes a connection unit electrically connecting the pluralityof thin films.
 28. A wireless power receiver comprising: a secondarycoil configured to receive power via a magnetic field generated by aprimary coil of a wireless power transmitter; and a magnetic fieldcontrol member having a first portion thereof configured to face theprimary coil and a second portion thereof configured to face thesecondary coil, wherein the magnetic field control member is configuredto focus the magnetic field between the primary coil and the secondarycoil.
 29. The wireless power receiver of claim 28, wherein the magneticfield control member is configured to cause the magnetic field to befocused on the secondary coil to reduce an influence of the magneticfield on parts of the wireless power receiver other than the secondarycoil.
 30. The wireless power receiver of claim 28, wherein the magneticfield control member includes a pattern unit comprising a plurality ofthin films spaced apart from each other by a fixed interval.
 31. Thewireless power receiver of claim 30, wherein the first portion and thesecond portion represent opposite sides of a substrate, and wherein thepattern unit is disposed on one side of the substrate.
 32. The wirelesspower receiver of claim 30, wherein the magnetic field control memberfurther includes a connection unit electrically connecting the pluralityof thin films.